CODEWITHSUNDEEP
c#regex
user584018
user584018

Reputation: 11364

C#: get all files based on regular expression

I have a folder which contains multiple Zip files with different naming convention.

  1. 1.zip
  2. Hello.zip
  3. SomeNameWithAnyCharacter-Xal_Yal_Zal_12345-20180518-152147535.zip

I would like to get all zip files which has below naming convention:

[SomeNameWithAnyCharacter]-[Xal_Yal_Zal_][yyyyMMdd][HHmmssfff]

How to apply regex for below code in C#,

var allFiles = Directory
  .GetFiles(@"C:\FilePath", "*.zip")
  .Select(f => new FileInfo(f))
  .OrderByDescending(fi => fi.LastWriteTimeUtc);

Upvotes: 1

Views: 338

Answers (1)

Dmitrii Bychenko
Dmitrii Bychenko

Reputation: 186833

Add Where with required regular expression:

  var allFiles = Directory
    .EnumerateFiles(@"C:\FilePath", "*.zip")
    .Where(file => Regex.IsMatch(
        Path.GetFileNameWithoutExtension(file),   // match file name
      @"Xal_Yal_Zal_[0-9]+-[0-9]{8}-[0-9]{9}$"))  // with the required regex
    .Select(file => new FileInfo(file))
    .OrderByDescending(fi => fi.LastWriteTimeUtc);

Pattern: Xal_Yal_Zal_[0-9]+-[0-9]{8}-[0-9]{9}$ explained:

Xal_Yal_Zal_ - Xal_Yal_Zal_ 
[0-9]+       - one or more digits 0..9
-            - minus sign
[0-9]{8}     - 8 digits 0..9, e.g. 20180518
-            - minus sign
[0-9]{9}     - 9 digits 0..9, e.g. 152147535
$            - anchor - end of string

Upvotes: 4

Related Questions